Lower Lactate Levels and Lower Intracellular pH in Patients withIDH-Mutant versus Wild-Type Gliomas

被引:8
作者
Wenger, K. J. [1 ,3 ,4 ]
Steinbach, J. P. [2 ,3 ,4 ]
Bahr, O. [2 ,3 ,4 ]
Pilatus, U. [1 ,3 ,4 ]
Hattingen, E. [1 ,3 ,4 ]
机构
[1] Univ Hosp Frankfurt, Dept Neuroradiol, Schleusenweg 2-16, D-60528 Frankfurt, Germany
[2] Univ Hosp Frankfurt, Dept Neurooncol, Frankfurt, Germany
[3] German Canc Consortium Partner Site, Frankfurt, Germany
[4] German Canc Res Ctr, Heidelberg, Germany
关键词
CARBONIC-ANHYDRASE IX; IN-VIVO; HUMAN BRAIN; TUMOR METABOLISM; MR SPECTROSCOPY; CELL-GROWTH; IDH1; EXPRESSION; GLUCOSE; CANCER;
D O I
10.3174/ajnr.A6633
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
BACKGROUND AND PURPOSE: Preclinical evidence points toward a metabolic reprogramming inisocitrate dehydrogenase(IDH) mutated tumor cells with down-regulation of the expression of genes that encode for glycolytic metabolism. We noninvasively investigated lactate and Cr concentrations, as well as intracellular pH using(1)H/phosphorus 31 (P-31) MR spectroscopy in a cohort of patients with gliomas. MATERIALS AND METHODS: Thirty prospectively enrolled, mostly untreated patients with gliomas met the spectral quality criteria (World Health Organization II [n = 7], III [n = 16], IV [n = 7];IDH-mutant [n = 23];IDHwild-type [n = 7]; 1p/19q codeletion [n = 9]). MR imaging protocol included 3D(31)P chemical shift imaging and(1)H single-voxel spectroscopy (point-resolved spectroscopy sequence at TE = 30 ms and TE = 97 ms with optimized echo spacing for detection of 2-hydroxyglutarate) from the tumor area. Values for absolute metabolite concentrations were calculated (phantom replacement method). Intracellular pH was determined from(31)P chemical shift imaging. RESULTS: At TE = 97 ms, lactate peaks can be fitted with little impact of lipid/macromolecule contamination. We found a significant difference in lactate concentrations, lactate/Cr ratios, and intracellular pH when comparing tumor voxels of patients withIDH-mutant with those of patients withIDHwild-type gliomas, with reduced lactate levels and near-normal intracellular pH in patients withIDH-mutant gliomas. We additionally found evidence for codependent effects of 1p/19q codeletion andIDHmutations with regard to lactate concentrations for World Health Organization tumor grades II and III, with lower lactate levels in patients exhibiting the codeletion. There was no statistical significance when comparing lactate concentrations betweenIDH-mutant World Health Organization II and III gliomas. CONCLUSIONS: We found indirect evidence for metabolic reprogramming inIDH-mutant tumors with significantly lower lactate concentrations compared withIDHwild-type tumors and a near-normal intracellular pH.
引用
收藏
页码:1414 / 1422
页数:9
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